Author Question: Blood flow in the placenta A) freely travels between mother and embryo as part of one circulatory ... (Read 98 times)

jc611 · **on:** Jun 22, 2018

Blood flow in the placenta

A) freely travels between mother and embryo as part of one circulatory system.
B) is blocked, keeping the embryo isolated from the mother's body.
C) is a potential cause of miscarriage.
D) allows certain substances to pass through the placenta, even though mother and embryo's circulatory systems do not mix.

Question 2

Young teens who are sexually active may be less likely to use contraception because

A) of lack of information.
B) they feel it isn't cool to use contraception.
C) they are not allowed to purchase contraceptives.
D) they cannot afford condoms.